One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(11,15)(14,16)(17,18,24,21)(19,20,29,31)(22,26,23,32)(25,27,30,28)(2,5)(3,7)(10,13)(11,15)(17,19,22,27,24,29,23,28)(18,25,32,31,21,30,26,20)(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,20)(18,19)(21,29)(22,25)(23,30)(24,31)(26,28)(27,32) involution — undirected(1,3,4,7)(2,6,5,8)(10,13)(14,16)(17,21,24,18)(19,20,29,31)(22,32,23,26)(25,27,30,28)(9,11,12,15)(10,14,13,16)(17,22,24,23)(18,26,21,32)(19,27,29,28)(20,30,31,25)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.